The History of JRC Weather Radar

1954 Japan's first weather radar(NMD-451).
1980 Japan's first airport weather radar(JMA-225).
1981 Japan's first Doppler weather radar(JMM-1).
2011 World's first S-band solid-state weather radar(JMA-254).
2013 C-band solid-state weather radar(JMA-540).
2014 X-band solid-state compact weather radar(JMA-912).

Image:Japan's first weather radar

Japan's first weather radar


Solid-state technology

JRC's new solid-state architecture integrates an advanced signal processing technology that detects and displays information at a new level.
These dedicated signal processing circuits are producing higher capability than a klystron radar or a magnetron radar, greatly exceeding detection performance.
Transmission power of the solid-state transmitter is small compared to the tube type transmitter, but by using the pulse compression technique, it is possible to impart the transmission capacity comparable to that of the tube type radar.

Low maintenance cost

The radar integrates a highly reliable solid-state transmitter in place of a life limited klystron or magnetron. The solid-state radar provides higher reliability and performance and will keep maintenance costs to a minimum.

Image:Solid-State Power Amplifier (C-band)

Solid-State Power Amplifier (C-band)


Fully solid state and high reliability.
Provides a wide range of applications for disaster prevention and research, and meteorological analysis



By using the newest signal-processing algorithm and data-processing algorithm, it is possible to observe a weather echo with high precision quantitatively in real time.

Image:Examples of a display

Examples of a display

JMA-912(X-band) JMA-540(C-band) JMA-254 Series(S-band)
Doppler ✁E/td> ✁E/td> ✁E/td>
Dual polarization ✁E/td> ✁E/td> *
Operating Frequency 9.70-9.80GHz
(5.25-5.35, 5.65-5.80GHz*)
Observation Range 80km@23dBz
Antenna Diameter ≤1.2m(=3.9feet) ≤4.3m(=14.1feet) ≤5m(=16.4feet)
Radome Diameter Approx.1.8m(=5.9feet) Approx.7m(=23feet) Approx.8m(=26.2feet)
Minimum Observation mesh 150m mesh 250m mesh 250m mesh
Target Local weather
Mobile RADAR
(High precision, low price,Space-saving, Mobile)
Meso scale weather
Airport weather conditions
(Cost-benefit system)
Wide area weather
(Long range observation)